As a Cat 4 road race ranking, I'm 12th of about 3550 people. 188 of about 3650 for criteriums. I just found these tonight on usacycling.org. The ranking is confusing but I think basically they take your best 3 races in a category and average them for your ranking. Different races have different values based on the number of riders, distance and importance, such as a state championship race. I printed the report to a PDF but it was 42 pages long.